单项选择题
Performance of a turbocharged engine can be improved by（）
A.decreasing the amount of valve overlap
B.preheating the air intake
C.after-cooling the intake air
D.preheating light fuel
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相关考题
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单项选择题
Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?（）
A.Planetary gear set
B.Torsional vibration damper
C.Friction clutch
D.Air bladder clutch -
单项选择题
When used in conjunction with a turbocharger, the main function of an after-cooler is to （）
A.increase the density of the cylinder air charge
B.prevent turbocharger overheating
C.liminate the need for a pre-cooler
D.remove moisture from air compressed by the turbocharger -
单项选择题
One of function of diesel engine lubricating oil is to （）
A.induce carbon formation on cylinder walls
B.improve fuel penetration in the combustion space
C.form a friction reducing film between mating surfaces
D.lubricate the fuel injection
